package com.cy.sp06.filter;

import com.netflix.zuul.ZuulFilter;
import com.netflix.zuul.context.RequestContext;
import com.netflix.zuul.exception.ZuulException;
import org.apache.commons.lang3.StringUtils;
import org.springframework.cloud.netflix.zuul.filters.support.FilterConstants;
import org.springframework.stereotype.Component;

import javax.servlet.http.HttpServletRequest;

@Component
public class AccessFilter extends ZuulFilter {
    //设置过滤器的类型，pre、routing、post、error
    @Override
    public String filterType() {
        //return "pre";
        return FilterConstants.PRE_TYPE;
    }

    //位置序号
    @Override
    public int filterOrder() {
        return 6;
    }

    //判断针对当前请求，是否执行过滤代码
    @Override
    public boolean shouldFilter() {

        /**
         * 调用商品判断权限
         * 调用用户和订单，不检查权限
         */
        //获得调用的服务id
        RequestContext currentContext = RequestContext.getCurrentContext();
        String serviceId = (String)currentContext.get(FilterConstants.SERVICE_ID_KEY);
        return "item-service".equals(serviceId);
    }

    //过滤代码
    @Override
    public Object run() throws ZuulException {
        //判断请求中有没有token
        //获得request对象
        RequestContext currentContext = RequestContext.getCurrentContext();
        HttpServletRequest request = currentContext.getRequest();
        //接收token参数
        String token = request.getParameter("token");
        //如果没有token，阻止继续访问，直接返回响应
        //token == null||token.length()==0||token.trim().length()==0
        if (StringUtils.isAllBlank(token)) {
            //阻止继续访问
            currentContext.setSendZuulResponse(false);
            //直接返回响应
            currentContext.addZuulRequestHeader("ContentType","text/html;charset=UTF-8");
            currentContext.setResponseBody("Not Login!");
        }
        //这个返回值不起任何作用，返回任何数据都可以
        return null;
    }
}
